At least I think it's related to distance.. FoR and FoL are maintaining advance-lunge distance. FoR takes the advantage and does an advance-lunge; FoL steps back preventing the attack from landing. FoR recovers forward, maintaining extension (PIL?); FoL retreats past advance-lunge. Q: Does FoR still maintain priority? Does FoR need to re-establish priority when he re-closes distance. Or can FoL make an extension effectively stealing priority?